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Not every program uses files or network connections, but every program uses memory. Memory-related errors are the bane of every programmer who uses a C-style language. Our friends in the Java and scripting worlds have it easy: memory management happens automatically for them, like having their parents clean up their rooms. We, on the other hand, have to make sure to allocate memory when we need it and free that memory when we re done. If we allocate without freeing, we ll leak memory: our program s memory consumption will grow and grow until we run out of memory and then the program will crash. We need to be equally careful not to use any memory after we free it. We might be using stale data, which can cause all sorts of errors, or something else might have moved into that memory, and then we end up corrupting the new stuff.

main() starts as it did before but adds a variable named result to capture the value returned by fgets() and error to catch the value returned by printf(): int main (int argc, const char * argv[]) { char title[ kMaxDVDs ][ kMaxTitleLength ]; short dvdNum; char *result; int error;

Declares The Declare statement lets you call code defined in external DLL files, although it works only with pre-.NET Windows DLL calls. The syntax for declares closely resembles the syntax used to define methods.

Note The behavior of your property setter method must be consistent with your @property directive. The first

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The problem is that the designer of the Clock class intended the methods encapsulated by the delegate to be invoked only when the event is fired. Here, Main( ) has gone around through the back door and invoked those methods itself. What is more, it has passed in bogus data (passing in a time construct set to two hours into the future!). How can you, as the designer of the Clock class, ensure that no one calls the delegated method directly You can make the delegate private, but then it won t be possible for clients to register with your delegate at all. What s needed is a way to say, This delegate is designed for event handling: you may subscribe and unsubscribe, but you may not invoke it directly.

THE REPORT-AUTHORING PROCESS:

Here s another real-world example:

Add the following lines to the @implementation section to complete the properties:

This is the first place in our book where we delve into the application built to accompany this text. We could have written the book without a sample application and contrived the examples, but we felt that to have a common theme throughout the book would give you the benefit of seeing how all the pieces fit together. Without a doubt, one of the key points we want to emphasize is the importance of testing. Sure, this book is about Ant, yet Ant exists as a tool for assisting with the development of software and does not stand alone. To reiterate: any program feature without an automated test simply doesn t exist. For developers to embrace testing as a routine, and even enjoyable, part of life, it must be easy. Ant facilitates this for us nicely with the ability to run JUnit test cases as an integral part of the build. Why is the Testing chapter the right place to start seriously delving into our application Because the tests were written first, our application did not exist until there was an automated test in place.

The coordinate system in Java s Graphics2D is different from the default coordinate system in PDF s graphics state. The origin of user space in Java Graphics is the upper-left corner of the component s drawing area. The X coordinate increases to the right; the Y coordinate increases downward. Java works in standard Red-Green-Blue (sRGB) as the default color space internally, but colors need to be translated. Be aware that anything with four color values is assumed to be ARGB, even when it s probably CMYK. (ARGB includes the RGB components plus an alpha transparency factor that specifies what happens when one color is drawn over another.) Watch out when using fonts. There s a big difference between the java.awt.Font and com.itextpdf.text.Font font classes. We ll discuss this in section 14.5.2. It s possible that you ll need to install a virtual X11 server to make the examples involving Java s Abstract Window Toolkit (AWT), such as the Graphics2D examples, work on Linux servers.

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